# Copyright 2014 Square Inc.
#
#    Licensed under the Apache License, Version 2.0 (the "License");
#    you may not use this file except in compliance with the License.
#    You may obtain a copy of the License at
#
#        http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS,
#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#    See the License for the specific language governing permissions and
#    limitations under the License.

module BackgroundRunner

  # Mixin included into every worker that operates with {BackgroundRunner}.

  module Job
    extend ActiveSupport::Concern

    included do
      if BackgroundRunner.runner.respond_to?(:extend_job)
        # call extend_job for this class...
        BackgroundRunner.runner.extend_job self

        # ... and all subclasses ...
        subclasses.each { |klass| BackgroundRunner.runner.extend_job klass }

        # ... and all future subclasses
        class_eval <<-RUBY
        def self.inherited(subclass)
          BackgroundRunner.runner.extend_job subclass
        end
        RUBY
      end
    end
  end
end
